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# Simple model of Fuse(PSpice)

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Simple model of Fuse(PSpice)

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### Simple model of Fuse(PSpice)

1. 1. FuseSimplified SPICE Behavioral Model All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 1
2. 2. Contents1.Benefit of the Model2.Model Feature3.Parameter Settings4.Fuse Specification (Example)5.Fusing Time vs. DC Current6.Fusing Time vs. Current Pattern7.Specific Fuse ModelSimulation Index All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 2
3. 3. 1. Benefit of the Model• Easily create your own fuse models by setting a few parameters, that’s usually provided by the manufacturer’s datasheet.• Enables circuit designer to safely test and optimize their circuit protection design, and to predict component and circuit stress under extreme conditions (e.g. at the fuse blow).• The model is optimized to reduce the convergence error. All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 3
4. 4. 2. Model FeatureThe model accounts for: 10 • Current Rating • Fuse Factor 1 Fusing Time (Sec.) • Internal Resistance 0.1 • Normal Melting I2tEnable the model to simulate fusing time(blow time) as a function of I2t. 0.01The model can be used for testing the 0.001blow time for the different current pattern. 0.1 1 10 100 Fusing Current (A)A one-shot switch, once fuse is opened itcannot be closed. Fig.1 Fusing Time vs. Fusing Current Characteristic All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 4
5. 5. 3. Parameter Settings• From the fuse specification, the model is characterized by setting parameters Irate, FF, Rint and I2t. Model Parameters: U1 Irate = the current rating of fuse [A] FF = Fusing Factor, the ratio of the minimum fusing current (the current FUSE that fuse start to heat up) to Irate. (e.g. Irate =400mA and the minimum IRATE = 400m fusing current is 620mA then FF = FF = 1.55 620m/400m = 1.55) RINT = 650m Rint = internal resistance of fuse I2T = 0.024 I2t = Normal Melting value [A2, seconds] Fig.2 Fuse model with default parameters All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 5
6. 6. 4. Fuse Specification (Example) 10 Current Internal I2t (A2, the minimum fusing current Part No. Rating R. max. seconds is 620mA, FF = 20m/400m = 1.55 (mA) (m) ) 1 Fusing Time (Sec.)CCF1N0.4 400 650 0.024 0.1 U1 0.01 FUSE IRATE = 400m FF = 1.55 0.001 RINT = 650m 0.1 1 10 100 I2T = 0.024 Fusing Current (A)Fig.3 Shows the complete setting of fuse model parameters by using data from thedatasheet of CCF1N0.4 provided by KOA Speer Electronics, Inc. All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 6
7. 7. 5. Fusing Time vs. DC CurrentSimulation Result Simulation Circuit 10A PARAMETERS: (960.962u,5.0000) dc_current = 1 sense U1 tF = 960.962usec. at IF = 5A FUSE I1 IRATE = 400m (6.0051m,2.0000) I1 = 0 FF = 1.55 RL I2 = {dc_current} RINT = 650m 1 tF = 6.0051msec. at IF = 2A I2T = 0.024 T1 = 0 (24.013m,1.0000) T2 = 100n 1.0A tF = 24.013msec. at IF = 1A 0 0 *Analysis directives: .TRAN 0 1s 500u 100u .STEP PARAM dc_current LIST 1, 2, 5 100mA 1.0ms 10ms 100ms 1.0s I(sense) Time• The simulation result shows the fusing times, tF, (the time that fuse blows) at the different fuse currents, IF . All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 7
8. 8. 5. Fusing Time vs. DC CurrentComparison Graph 10 Measurement Simulation 1 Fusing Time (Sec.) 0.1 0.01 0.001 0.1 1 10 100 Fusing Current Graph shows the comparison result between the simulation result vs. the measurement data. The fusing current error (average from 0.001-10 sec.) = 4.9% All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 8
9. 9. 6 Fusing Time vs. Current PatternSimulation Result Simulation Circuit 2.0A sense1 U1 1.5A tF = 149.796msec. for triangle wave FUSE I1 IRATE = 400m (149.796m,959.222m) IOFF = 0 FF = 1.55 RL1 RINT = 650m 1 1.0A FREQ = 50 I2T = 0.024 IAMPL = 1 PHASE = -90 0 0 0.5A sense2 U2 0A FUSE I2 IRATE = 400m -0.5A TD = 0 FF = 1.55 RL2 TF = 10m RINT = 650m 1 I2T = 0.024 PW = 0 -1.0A PER = 20m 0 I1 = -1 0 I2 = 1 (59.503m,-987.814m) TR = 10m -1.5A tF = 59.503msec. for sine wave -2.0A .TRAN 0 0.2s 0 100u 0s 20ms 40ms 60ms 80ms 100ms 140ms 180ms I(sense1) I(sense2) Time• The simulation result shows the fusing times, tF, (the time that fuse blows) for the same peak current but different in current patterns(waveforms). All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 9
10. 10. 7. Specific Fuse Model Comparison Graph 10 Measurement Simulation U1 1 Error reduce to 0.4% Fusing Time (Sec.) CCF1N0_4 0.1 Model of fuse part number 0.01CCF10.4, all parameters and function are already set 0.001 0.1 1 10 100 Fusing CurrentIf the most accurate result is required, we could provide the specific model thatoptimized for each part number of fuse. The fusing current error (average from 0.001-10 sec.) will reduce from 4.9% (simplified model) to 0.4% (specific fuse model) All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 10
11. 11. Simulation IndexSimulations Folder name1. Fusing Time vs. DC Current.................................. DC2. Fusing Time vs. Current Pattern............................ Pattern All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 11